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Acta Phys. Chim. Sin.  2011, Vol. 27 Issue (12): 2841-2848    DOI: 10.3866/PKU.WHXB20112841
Inhibition Effect of Nitrotetrazolium Blue Chloride on the Corrosion of Steel in Hydrochloric Acid Solution
LI Xiang-Hong1, DENG Shu-Duan2, FU Hui1
1. Faculty of Science, Southwest Forestry University, Kunming 650224, P. R. China;
2. Faculty of Materials Engineering, Southwest Forestry University, Kunming 650224, P. R. China
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Abstract  The inhibition effect of nitrotetrazolium blue chloride (NTBC) on the corrosion of cold rolled steel (CRS) in 1.0-5.0 mol·L-1 HCl solution was investigated by weight loss method, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results show that NTBC is a good inhibitor for CRS in 1.0 mol·L-1 HCl solution and the adsorption of NTBC on the CRS surface obeys the Langmuir adsorption isotherm. Inhibition efficiency increases with inhibitor concentration while it decreases with hydrochloric acid concentration and temperature. The adsorption thermodynamic parameters (adsorption free energy ΔG0, adsorption enthalpy ΔH0, adsorption entropy ΔS0) and corrosion kinetic parameters (corrosion rate constant k, kinetic reaction constant B) were also calculated. Based on these parameters the inhibitive mechanism is discussed. Potentiodynamic polarization curves show that NTBC acts a mixed-type inhibitor. EIS spectra exhibit one capacitive loop at high frequency and this is followed by a small inductive loop at low frequency, and the charge transfer resistance increases with inhibitor concentrations. SEM clearly shows that the addition of NTBC can drastically retard the corrosion of steel in hydrochloric acid media.

Key wordsCorrosion inhibitor      Nitrotetrazolium blue chloride      Steel      Hydrochloric acid      Adsorption     
Received: 19 July 2011      Published: 30 September 2011
MSC2000:  O646  
Corresponding Authors: LI Xiang-Hong     E-mail:
Cite this article:

LI Xiang-Hong, DENG Shu-Duan, FU Hui. Inhibition Effect of Nitrotetrazolium Blue Chloride on the Corrosion of Steel in Hydrochloric Acid Solution. Acta Phys. Chim. Sin., 2011, 27(12): 2841-2848.

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